What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

How long does an analysis take?

Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

How accurate are the results?

Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

What security checks are performed?

The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

Back to Search

surfline.com

https://surfline.com· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

surfline.com

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

54.176.50.115

Server Location

🇺🇸 San Jose, United States

ASN

AS16509

Organization

AWS EC2 (us-west-1)

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns-1150.awsdns-15.org.ns-126.awsdns-15.com.ns-1741.awsdns-25.co.uk.ns-544.awsdns-04.net.

Performance

Page Speed

15 KB

106 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Next.js

CMS

WordPress

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

Cloudflare

Technology Stack

9 Technologies Detected

Analytics

CSS Frameworks

Meta Frameworks

Fonts

Customer Support

CDN

SEO Analysis

C64/100

surfline.comsurfline.com

SURFLINE.COM | Global Surf Reports, Surf Forecasts, Live Surf Cams ...

The most accurate and trusted surf reports, forecasts and coastal weather. Surfers from around the world choose Surfline for dependable and up to date surfin...

Title truncated. Description truncated.

Title Length86 chars

Recommended: 50-60 chars

Description Length228 chars

Recommended: 120-160 chars

Issues (0)

5 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

212 rules

Sitemap reference found

Sponsored

Security Score

26%Critical

Interactive

HTTPS

WAF

55d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

15.01.2026

Valid Until

15.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.surfline.com

SHA-256 Fingerprint

56:A8:E1:60:0E:E7:B2:61:DD:93:C8:4F:0C:01:AE:AA:1D:D3:F2:9B...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

date

Wed, 18 Feb 2026 06:42:18 GMT

content-type

text/html; charset=utf-8

content-encoding

📦 Gzip(gzip)

vary

Accept-Encoding

x-powered-by

Next.js

cache-control

🔴 No Cache(private, no-cache, no-store, max-age=0, must-revalidate)

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

surfline-com.mail.protection.outlook.com

Domain Information

surfline.com

Domain Age

30y 10m

Created

07.04.1995

Expires

08.04.2029

Last Updated

08.02.2024

Registrar

Network Solutions, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Legitimate interest basis mentioned

Typography & Readability

Helvetica + Linear Sans

70/100

Readability

/30

24/40

14px · LH 1.29

Hierarchy

/20

25/25

4.29x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Helvetica

Sans60px

Body Font

Linear Sans

Sans14px

Contrast Ratio

Reading Comfort

~71 CPL

Optimal (45–75)

60px

16px

20px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Strong hierarchy: Headlines are 4.3x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

✅ Optimal line length: ~71 characters per line is comfortable to read.

⚠️ Cramped layout: 137 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

SegmentEnterprise

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

26 Resources

Scripts

Styles

Async

Defer

Top Script Sources

wa.cdn-surfline.com(12)cdn.cookielaw.org(2)ads.blogherads.com(2)cdn.segment.com(1)websdk.appsflyer.com(1)

Website Identity

Facebook X (Twitter)Instagram TikTok

Sponsored

Last analyzed: 18 Feb 2026 at 06:42

Historical Analysis & Change Tracking